Mathc initiation/Fichiers h : c54a7

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	x_gdxdy.h

/* ---------------------------------- */
/* save as x_gdxdy.h                  */
/* ---------------------------------- */
double gint_dx(

double (*P_M)(double x, double y),
double (*P_N)(double x, double y),

double (*Px0)(double y),
double (*Px1)(double y),
   int   nx,
   
double    y
)
{
   int i = 0;
double m = 0.;
double M = 0.;

pt2d  t;

 for(i = 0; i <= nx; i++)
 {
       if(i ==0 || i== nx){m = 1.;}
  else if(fmod(i,2) == 0 ){m = 2.;}
  else                    {m = 4.;}

  t.x = ( ((*Px0)(y)) + i*(((*Px1)(y))-((*Px0)(y)))/nx );
  t.y = y;  

  M += m * (fxy_x((*P_N),H,t) -
            fxy_y((*P_M),H,t) );
 }

  return( ((((*Px1)(y)) -((*Px0)(y)))*M) / (3*nx) );
}
/* ---------------------------------- */
double green_dxdy(
double (*P_M)(double x, double y),
double (*P_N)(double x, double y),

double (*Px0)(double y),
double (*Px1)(double y),
   int   nx,
   
double   y0,
double   y1,
   int   ny
)
{
   int i = 0;
double m = 0.;
double M = 0.;

 for(i = 0; i <= ny; i++)
 {
       if(i ==0 || i== ny){m = 1.;}
  else if(fmod(i,2) == 0 ){m = 2.;}
  else                    {m = 4.;}

  M += m * gint_dx((*P_M),(*P_N), (*Px0),(*Px1),nx,(y0+i*(y1-y0)/ny));
 }

  return( ((y1-y0)*M) / (3*ny) );
}
/* ---------------------------------- */
/* ---------------------------------- */